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Experimental and numerical study on the auto-ignition of pressurized syngas leakage through a tube

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  • Lyu, Guowei
  • Gou, Xiaolong

Abstract

Integrated experimental and numerical investigations are conducted to examine tube-leakage-induced auto-ignition of H2/CO syngas. Experimental results demonstrate that increasing the CO mole fraction significantly reduces the shock wave intensity during leakage while elevating the required ignition pressure. Notably, auto-ignition is observed at CO mole fractions up to 30 % under sufficiently high syngas-air pressure ratios. For all tested compositions, the theoretical shock Mach number remains near 3.5 at critical auto-ignition conditions. Numerical simulations indicate that syngas composition influences leakage auto-ignition primarily through shock intensity rather than chemical reactivity. A prediction method for the critical auto-ignition pressure of hydrogen-rich gas leakage is proposed. This method uses experimental data to correlate average molecular weight with theoretical critical shock Mach number, enabling the generalization of critical leakage auto-ignition pressures across different gas mixtures. Validation against current and previous unobstructed straight-tube experiments confirms the reliability of this method. This framework provides fundamental insights for risk assessment and the safe operation of syngas systems.

Suggested Citation

  • Lyu, Guowei & Gou, Xiaolong, 2026. "Experimental and numerical study on the auto-ignition of pressurized syngas leakage through a tube," Renewable Energy, Elsevier, vol. 256(PE).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:pe:s0960148125019366
    DOI: 10.1016/j.renene.2025.124272
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    References listed on IDEAS

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